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Thread: Hyperthreading
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04-11-2004, 06:53 PM #1Web Hosting Master
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Hyperthreading
I have seen this term used a few times and wondered if someone could explain to me exactly what it is and what the difference is from normal.
Thanks in advance for answering a newb question...• Greg Lubbelinkhof
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04-11-2004, 06:57 PM #2Web Hosting Guru
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HT or HyperThreading Technology - easiest way to put it. One processor acting as two. Allowing applications and the OS to have two threads(or processes) done in each cycle.
Does not mean that a 3.0GHZ P4 w/ HT with out perform 2- pIII 1.5GHZ though. Lots of other factors come into play. Cache size being a very important one. Also two _physical_ CPUs will handle the load better than "_one_ acting as two"
If you want more search on google... heres one thing that might help. http://searchwin2000.techtarget.com/...828854,00.html
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04-11-2004, 07:05 PM #3Web Hosting Master
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so if I have the choice between a Dual Xeon 2.8 and a P4 3.0Ghz w/HT I take the Xeon correct?
• Greg Lubbelinkhof
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04-11-2004, 07:06 PM #4Web Hosting Guru
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Yes. Most likely that P4 is the older generation with a 512 cache. (not even sure if the 3.0 comes with the larger cache of today or not...have to check) But most likely those Xeons has a larger cache...not to mention they are a lot better.
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04-11-2004, 07:07 PM #5Web Hosting Master
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Defintly as HT will not give you near the 200% performance as a Dual Box would ( I know really its like 180% but for the sake of argument)
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04-11-2004, 08:27 PM #6Been around for too long...
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Dual Xeons at that speed should have hyperthreading too, so that will be two physical CPUs, showing up as 4.
- Matt
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04-12-2004, 02:15 AM #7Web Hosting Master
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Don't even think about it, go for the dual xeon one, you will be impressed with the power it delivers compared against the P43.0HT.
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04-12-2004, 02:38 AM #8Web Hosting Master
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I love hyperthreading and not just because the idea was invented inside my department at the UW. Check out the wikipedia defintion of HT at http://en.wikipedia.org/wiki/Hyperthreading
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04-12-2004, 05:05 AM #9Retired Moderator
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so running dual xeon in HT mode is better than running them as dual CPUs with noht option in lilo.conf ?
some ppl said it might give better performance for loaded mysql boxes, are they wrong?Bashar Al-Abdulhadi - KuwaitNET Internet Services Serving customers since 1997
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04-12-2004, 12:47 PM #10Web Hosting Master
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Sure running dual xeons in HT mode is better than running them as non-ht processors.
It's just a matter of the amount of threads that can be passed to the processor at the same time, and therefore the time it needs to complete the job.
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04-13-2004, 02:52 AM #11Retired Moderator
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Originally posted by schmeg007
I love hyperthreading and not just because the idea was invented inside my department at the UW. Check out the wikipedia defintion of HT at http://en.wikipedia.org/wiki/Hyperthreading
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04-13-2004, 03:17 AM #12Web Hosting Master
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University of Washington Computer Science department is what I was referring to.
EDIT:
No, I didn't get to work on the research project, it was a bit before my time .
A link to the project: http://www.cs.washington.edu/research/smt/Last edited by schmeg007; 04-13-2004 at 03:28 AM.
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04-13-2004, 03:53 AM #13Retired Moderator
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Originally posted by schmeg007
University of Washington Computer Science department is what I was referring to.
EDIT:
No, I didn't get to work on the research project, it was a bit before my time .
A link to the project: http://www.cs.washington.edu/research/smt/